Hardness meaning

härd'nĭs
The relative resistance of a metal or other material to denting, scratching, or bending.
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The state or quality of being hard (in various senses)
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The quality of being hard.
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An instance of this quality; hardship.
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The quality or condition of being hard.
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The relative resistance of a mineral to scratching, as measured by the Mohs scale.
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The relative capacity of a substance for scratching another or for being scratched by another.
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A measure of how easily a mineral can be scratched. Hardness is measured on the Mohs scale.
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Origin of hardness

From hard +‎ -ness.